This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 20 |
| 6 | 118 |
| 7 | 937 |
| 8 | 11936 |
| 9 | 272771 |
| 10 | 11992996 |
| 11 | 1018892793 |
| 12 | 165089910412 |
| 13 | 50502010570950 |
| 14 | 29054155189364119 |
| 15 | 31426485955571756316 |
| 16 | 64001015703946097640927 |
| 17 | 245935864153501211843554826 |